A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied to the assembled collection of the drill pipe, drill collars, tools and drill bit. The drill string is hollow so that drilling fluid can be pumped down through it and circulated back up the annulus (the void between the drill string and the casing/open hole).
Photos taken from the book.
Book Name: Drilling String Components
Author: DRILLMEC
Language: English
Price: Free
Size: 8.25 MB
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As known, The drill ring is summed up tub tube and the accessories used to run a drill down. The drilling series consists of drilling hoops, drill pipe, heavy drill pipe, and other components such as drilling pit and stabilizers.
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